problem with minmax function

[LuTrindade]

In[9]:

def load_image(file_name_rgb, file_name_tif):    
    rgb = tiff.imread(str(file_name_rgb))    
    rgb = minmax(rgb)    
    tf = tiff.imread(str(file_name_tif)).astype(np.float32) / (2**11 - 1)
    
    return np.concatenate([rgb, tf], axis=2) * (2**8 - 1)

When I run this part an error occurs, can someone help me?
in.py is a file where I put TernausNet Demo!

---

runfile('C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master/in.py', wdir='C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master')
Reloaded modules: models, models.ternausnet2, modules, modules.bn, modules.functions, modules.wider_resnet, modules.misc, modules.residual
Traceback (most recent call last):

File "", line 1, in
runfile('C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master/in.py', wdir='C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master')

File "C:\ProgramData2\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 786, in runfile
execfile(filename, namespace)

File "C:\ProgramData2\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master/in.py", line 108, in
img = load_image(file_name_rgb, file_name_tif)

File "C:/Users/L.DEOLIVEIRATRINDADE/Documents/04. Programas desenvolvidos/TernausNetV2-master/in.py", line 80, in load_image
rgb = minmax(rgb)

NameError: name 'minmax' is not defined

[LuTrindade]

Solved, restart the Demo